Well... in my opinion... YES, he is gonna be there!
why? you ask me?
let's put it this way...
1. there's a 99% possibility that the new iPhone will be announced that day. (to start shipping mid-july)
2. there's a 90% possibility that the iPhone OS 3.0 will be fully released that day too!
3. there's a 80% possibility that Mac OS X 10.7 "Snow Leopard" will also be announced that day. (and start shipping either the same day or a bit later on in the summer)
4. there's a 70% possibility that the much-talked-about touch screen "Netbook" will also be announced that very same day...
AND he said he'll be off duty until the "end" of june and WWDC is either Mid-June or early June... so a week or two ahead of his planned return won't hurt him...
IF Steve returns that day with a "1, 2, 3, 4" presentation for the iPhone, iPhone OS 3.0, Snow Leopard, and NetBook... shares will soar upwards! Media will go crazy! and us? even Crazier!
Let's just hope he will get better! We miss his keynotes!