If you believe in the April release rumor...

[Bad_Apple]

i guess i shouldn't answer this, bc I don't even belive that the cd will be released in april....unless it's on april fools or something (with blank cd in the case!)
it was a one in a million shot that they showed up on mtv, and that was to kick start their ill-fated tour.
so I would say there is a more likely chance that Anna Nicole Smith will make an appropriate speech (i.e. not look like she's high) on the show than gnr perform on the Grammys.

[Luigi]

Here to tell you 

[Prez]

I'm sure GNR won't be at the Grammys, but if they are planning to release it in April, it might be smart to run the first ad for CD during the Grammys, like Eminem did during the VMAs this year.