With PS4 and X720, the next systems will be sure to be in line with the best specs the PC will offer at the time, even better.
Do you think the game will be much more massive? I hope they will create a new engine and there really shouldn't be no excuse to have so many glitches and bugs next time around since the systems will be that much more powerful and capable to handle it.
I'd like to point out that, as it stands, optimistic estimates for the beginning of the next generation of consoles put them in the 2015 range. More reliable estimates put it more around 2017. This is because of technical limitations, and all other 'new' products between then and now are likely to be gimmics to keep people playing with outdated technology.
As such, unless Bethesda works closely with the console designers of the future to create a game tailor made for the console, and launches during said consoles release, we will probably have a new TES game BEFORE we have new consoles. At the same time, multi-platform games are extremely rare for console releases because the console companies are highly protective of their products during development, and are unlikely to allow a compant access to their tech while said company is also working with a rival. That is why release titles are almost always exclusives.
All of that said, do i think TES6, whatever it is and whenever it comes out, has to potential to be an absolutely killer RPG? Yes. But that has more to do with how Bethesda approaches it than whatever platform they decide to launch it on.