Why on earth would they put HD-DVD in the nextBox, it has less space than Blu ray and they dont make films on hd-dvd anymore, consoles are now in an era where there pushing thereselves as media hubs not just gaming machines. 

MS will either go diskless or with blu-ray. Disk-less would be a big gamble though as 40% of current gen aren't connected to the internet and of the 60% that are god knows if there download speeds and fair-usage policies are up to massive data consumption.

Wii doesn't even play DVD films so possibly Nintendo  still wont be interested in the media hub element and will opt again for a proprietary format.

i expect them all to do so or the next best thing.

None will use BR, BR is old hat now never mind in 2012

Why not an industry standard format? Theres no harm in say Microsoft and Nintendo working together on a common format.

lol i was going to say yes as well but your options to pick don't give me that choice. Unless Sony decide's to take another leap forward with an even bigger disc which wouldn't make much sense but still possible.

thatthat would be a huge mistake on Microsoft's half to make everything Downloadable. The next Xbox will be off the market before ps3 even hits shelves so i don't see this happening. Im sure most people agree they like holding a physical item in there hands not having something in virtual space that has no resell value. 

Nintendo wont, they dont do this sort of thing, people should know that by now lol

You mean like Blu-ray?  For most of the tech industry, it is the format.  I believe Apple is the only company now completely abstaining from the format.  Microsoft even supports it for Windows directly, which means they have to pay a small royalty to the BDA.

I think 720 and PS4 will use BD next gen (didn't see that as an option).  Wii will probably use a variant.

The only thing MS would have to be concerned about is the image among its fans in thinking that they are supporting a "Sony" format.  "Sony" because Panasonic actually owns more of the format than Sony.  As far as I know, MS supports DVD and CD, which Sony has some ownership of.

If anything, the PSP GO should be a lesson about discless formats.

Microsoft working with another company when they cannot use their monopoly leverage WARNING foul language:

I think Nintendo will go back to cartridges.