Spectre has a lot going for it as long as you can get along with the design, rMBP is unlikely to offer much more at a considerably higher price point. for most purposes 1080p is adequate for 13" notebooks downwards, and is also more suitable for those with gaming in mind, with less pixels for the iGPU to push. The ability to expand the the SSD in time is a bonus, especially for those who prefer to carry significant multimedia onboard. I see the Spectre & Samsung's 13" Notebook 9 sitting squarely between the rMB & rMBP in both performance & portability.
We are only going to see thinner & lighter with TB3 if we are lucky for the 2016 rMBP, I expect very little of Apple these days. Innovation with the Mac ceased several years back, hence why we see the current lacklustre lineup. Find it very interesting that the Spectre has TB3 and Apple rMB does not, especially as the HP has a lower rated battery & far higher rated CPU, there is the physical space argument, equally I rather feel that the omission of TB3 from the 2016 rMB is more related to Apple`s sales strategy than technology.
Apple should absolutely revise the cost of their in-house RAM & SSD upgrades, however as Apple has a monopoly on OS X hardware they will likely to continue to ripoff their customers to boost margins.
Q-6