I'm not sure what to think....
On one hand, it doesn't make sense that they would release the 3G phone in May. First of all, they haven't announced an event and unless the 3G phone is simply a chip update and GPS, nothing else hardware wise, then they would want alot of press leading up to it. Also, as mentioned above, why would they release it ahead of the firmware 2.0 update.
On the other hand, Steve could be suprising us with an early release of the 2.0 update and a new iPhone and I don't think its too farfetched to believe that they would come out with a tablet. So I'm up in the air, I'm gonna hold back my excitement until we hear something actually convincing, out of left field rumors just aren't enough for me to get excited over. For the sake of a more feature 3G iPhone, I'm hoping it won't be til WWDC, as this would give them a stage (literally) to build up press before hand and then release something truly great and updated.
Then again, I would love to see a tablet coming out of Cupertino. Again though, as mentioned above, if they release a tablet, what does someone pick as a traveler? An Air, a tablet, a macbook, a macbook pro, an iPhone? Too many choices.
Maybe they'll release it all at WWDC but there will be something else alongside, not a tablet though... New form factored MacBooks and MacBook Pros!!! Thats what I'm talking about.