SCV was geared toward attracting newcomers, SC6 is geared toward old school SC players who miss sc1-sc2. Aris's assessment of sc6 (so far) basically says that this game feels more like older SC's in terms of movement and tracking verticals. Soul charge returns, and meterless GI returns. This is clearly marketed for the veterans.
That's not to say that newcomers won't play it, but I don't think that's the focus this time
I just see them targeting a wide player base versus gearing towards a specific group of people. The game offers something for everyone. The movement and returning characters are going to attract veterans while Reversal Edge, meter, flashiness and other changes are there for newcomers.
There is nothing in SC5 that indicates it was meant for newcomers, it was simply an attempt to bring new faces into the roster because SC4 didn't have enough attention. This has absolutely nothing to do with new players, specially considering that the gameplay had became relatively more complicated now that all characters had extended combos, which means that veterans, who knew the basics from the start, would always have an advantage. Also, soul charge does not work in the same way as before and meterless GI only is a thing again because people hated to spend meter on GI.
SC4 sold more than SCV, so how didn't it get enough attention? The changes in SCV was geared towards newer players and the SF crowd because that was the developer's intention, and it worked because those new players are either still playing SCV now or are on this site derailing threads.