Thanks for sharing the predictions. Any idea when it might happen? 
What I wonder though is why Apple does not allow more RAM (or SSD) for its current models. Is it driven by profit considerations, or is it driven by genuine, technical considerations?
So, for instance, why is it that the current MBAs are limited to 8 GB (and not upgradable).
From a lay person's perspective, I could imagine that profit considerations could be for current MBA users to always have to buy new MBAs if they want higher specs such as RAM (regardless of whether they need it).
"Technical" considerations could be: it is hard to allow more RAM and to keep the machine slim and lightweight at the same time.
Which is closer to truth, or what would be the truth?
What I wonder though is why Apple does not allow more RAM (or SSD) for its current models. Is it driven by profit considerations, or is it driven by genuine, technical considerations?
So, for instance, why is it that the current MBAs are limited to 8 GB (and not upgradable).
From a lay person's perspective, I could imagine that profit considerations could be for current MBA users to always have to buy new MBAs if they want higher specs such as RAM (regardless of whether they need it).
"Technical" considerations could be: it is hard to allow more RAM and to keep the machine slim and lightweight at the same time.
Which is closer to truth, or what would be the truth?
I'm pretty sure rMBA would start at 4GB RAM, though I doubt it'd go to 16GB.
What I would like the line to look like with starting and upgrade options:
rMBA12: Dual Core, 4GB RAM (8GB MAX), 128GB Storage (512GB MAX), HD6000 Graphics
rMBP13: Dual Core, 8GB RAM (16GB MAX), 256GB Storage (1TB MAX), Iris Graphics
rMBP15: Quad Core, 16GB RAM, 256GB Storage (1TB MAX), Iris Pro Graphics (Discrete Optional)
Very clean and simple. 8GB RAM available for all machines, Pros have at least 8GB, 16GB option on the 13", 16GB Standard on the 15". Decent integrated graphics on all machines, Iris on the mid-level, Iris Pro on the high end. Discrete optional on the high end. 256GB minimum on Pros. 1TB option on Pros. 2nd Thunderbolt on Pros, HDMI on Pros, USB 3.0/SD Card standard on all machines, magsafe 2 standard everywhere.
This also gives some separation between the rMBA and the rMBP13. Pro starts at double the memory and storage of entry air. Pro also gives upgrades double the max air. Pro also has better integrated graphics.
Pro 15 already has enough to separate itself from Pro 13. Quad core, Iris Pro, and discrete graphics, not to mention 16GB memory standard.