Don't really care much about retina. However I would love to have 6 GB of RAM on my laptop. I will never understand why Apple never allowed 3 GB of RAM for iBook G4...
BTW my ibook and my main desktop machine have the same amount of RAM

But it can play 1080p, Youtube at 720p, Quake 4 and Halo 2... and I bought it in 2006... oh well
I am always wondering, why so many people talk about things I can not do. I have a higher specked ibook G4, than your PowerBook and I can't watch 1080p. I guess I am just too stupid and do not know how to use stuff
The G4's memory controller can't access more than 2GB of ram.
I wonder, if the ibooks/powerbooks with presoldered RAM under 1GB could be tinkered to accept the whole 2GB. Like soldering a 1GB RAM instead of the lets say 512MB presoldered, the rest 1GB would of course go to the "user servicable" RAM slot.
Not for their time.

Anyway, later models could support up to 4GB (I think).
But no G4. There are G5s that can only accept 4GB, I know for sure the Dual 1,8GHz PCI (not PCI-X, the latter can accept 8GB) and the Single 1,6GHz G5 can only take 4GB (the Dual 1,8GHz has only four slots, but there is space where the other four would usually be).
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I am always between nostalgia and "what if...", when I think about my PowerMacs. I have an iMac G3, which was my first ever computer (didn't ever possess a Win-PC). Takes away space on my small desktop and I have faster PowerPC Macs even, if I would use it only for playing, but then again I just can let it go and I also ca not put it in its original box. Once a year over the new year's holidays I play Master of Orion on it, though I could easily play it in classic mode on my ibook G4.
Then I have my ibook, which I use for daily web browsing. Because I am a bit of a cheap person, so I do not power up my PowerMac for web browsing (all though the outcome of the electricity bill at the end of thee year would not hit the roof). Then while web browsing (having tested TFF, Sunrise, Omniweb, Seamonkey, Camino, icab and gotten back to Safari and FF), I sometimes open mails, may sister sends to let me show pictures to relatives, that are at my place. Sometimes I have to say "wait a second". Everyone is used to click and see, email attachments of big foto files.
There are very few site, that I visit for myself, that have long loading times and then the inner monologue starts "hm, if... I would get me an Intel-Mac, I could save bits of time. Would that be much at the end of the year? Hm, but which one then? iMac? No firewire400 for my audiointerface - I dare not think one minute about connecting a thunderbolt adapter to FW800 to FW400 (latencies?). MacMini? Hm, FW800 to FW400 adapter, at least acceptable, but than again price versus power compared to the iMacs?" A Macbook Air/Pro is a price-performance looser for me, too, because I wanted the next computer I ever buy to be a desktop and hooking up a display to a laptop is somehow crippled, too. I am so used to 5:4 on my ibook, that I find even the 15" Macbook Pro's display to be unbearable squeezed and small. Well, OK, actually I do not have a need for a new machine, my software is outdated, but still does the job and on the other hand, I do not want to get a feeling of neglecting my old Macs. Then, I think, well ok next time, in a year or two I will make the move, when I really need to... and so it goes on and on.
What is sometimes forcing patience is converting video, but since that is for private use, well I can live with that.
There is another thing. Mac OS, which is, from the way you do things the same on PPC and Intel (I guess). My brother sometimes tells me "oh that Windows 8 of my wife has that thing, that things happen, when you move the cursor in one corner or the other. That's annoying" I say "well that is "active corners" I have this on Mac OS X, I do not remember since what of the first versions, I could tell you go to system preferences and your done, but sorry I can't help you with that Windows8". This applies to several features.

(I do not say, that Windows is bad, I just say, I can have those "new" features without spending extra cash on new stuff.).
If my post sounds stupid or to emotional or like a "Intel is bad... Win is bad...".type of guy, please forgive me it is not intended that way.
