I don’t have any plans of this nature. In fact, I just purchased a 7th generation video game console (I plan to make good use of it). I will not be purchasing an 8th generation video game console anytime soon...
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I'll get the next Sony console for sure but the next Microsoft console? I hardly play my 360 now. Once Gears 3 is released I'll play the crap out of it but right now that's the only game I'm looking forward to on that system.
I'll get a PS4 when the price drops and after they work out all the bugs, or if they release a Kingdom Hearts game for it. Whichever comes first.
As for another system, probably a PSVita or 3DS, but no other console. I never buy Microsoft, and Nintendo consoles haven't appealed to me much since Gamecube.