It's obvious that we will see new consoles from Microsoft and Sony in 1-2 years. But which console do you think will be more successful? 

I honestly believe that Microsoft will kill Sony in the USA and Britain, much more than it did this gen.  I'm not sure about other countries.

No option for the Wii U? D=

Between the two.

Obviously we know nothing about either of them yet, but it doesn't look like Sony have learnt anything from the PS3 (as can be seen from the Vita), so I think that the 720 will have next gen.

Well, considering we have absolutely no concrete facts about either console at this point in time, aside from possible development code names, it's way to early to call this.

X720 just for the lulz.

Wii U

I think it all comes down to the price. Make it even and Playstation 4 should win if this generation is anything to go by (which it isn't?).

Of course software matters a lot too, but we don't know anything about them yet. What we do know is that PS3 would have sold more than X360 by now if their price tags would've been even throughout the generation.

We know nothing (lol), but I predict Xbox 3 will win. If not by sales then by profit margin.

Yeah, I'll vote Wii U too, just because it's been annouced, and we have a broad idea of the games in development. 

PS4

  720 isnt going to have a year head start

that means that 720 wont have a full 12 months to build a library of 1st and 3rd party games before PS4 releases

they also wont have the full 12 months to gather in sales before PS4 is launched

the devs wont automatically develop games on  720 1st so its more up in the air with which console will be developed for 1st

they will most likely launch at a closer price point than what we seen with ps3 and 360

PS4 should have the big PS Eye around to raise its sales in the holidays. Kinect 2.0 wont be able to save 720's ass like the Kinect did for 360 this gen

this will leave it all to the exclusives and everybody knows that Sony outshines microsoft in the exclusives area

so i say PS4 easy!