Well that helps to confuse things. I guess we'll know only when Korg makes an announcement. Then again, Matrixsynth is usually pretty reliable.
Usually, yes. But on the other hand this rumor is in itself nothing new. It has been around since summer at the latest - not even counting in the wishful thinking about this, which started around the last NAMM. As Korg seems to have revived the brand ARP - at least that's the impression one gets when you visit the corresponding site -, it would seem possible.
On the other hand, and as I said above, the Odyssey isn't selling too well. All of its limited versions (Mk I and II) are still available. A nearby store hasn't sold any since late summer and even at the Guitar Center here they collect dust. I think they are priced slightly too high. $799 would have been perfect, without the case I'd say $699 - at least for the shrunken version it is.
Now, if they would rebuild the 2600, what would a realistic price be? The full sized MS-20 kit was $1,499. So I would somehow assume something like $1,999 for a full sized version. But at that price point we could all relax, lean back in our chairs, and wait for the Black Friday deals next year as such a synth wouldn't fly off the shelves. It would neither be an impulse buy, nor be exceptionally attractive for musicians who start getting into analog synthesis. Also, think about what else you could get at that price point. But even a mini version for about $999 to $1,299 wouldn't sell out in a couple of months. I just can't see that happening. And that's where I start to doubt such a project simply in terms of business decisions.