While Nintendo Wii U is available in market, it is not such a great hit as was launch of Nintendo Wii. Multi screen gaming has not lured the audience enough.
Sony has so far only released the specs of PS4 console. From the specs Architecture looks very promising. There is Motion control, Security, touch pad capabilities on controller, Social integration, Mobile gaming support & TV viewing experiences.
Microsoft is going to release next major release of of Xbox console, that is XBox 720. This is suppose to have enhanced hardware like 8GB of DDR3 Ram and 32 MB of ESRAM. There will be more Metro Interface like Windows 8. More integration with Social & Television.
Nintendo seems to be going out of the competition slowly, there are possibilities of new Android based consoles entering the gaming arena.
Most of these consoles will target the christmas 2013 shopping season.