Last minute prediction based on combined rumors: Apple has decided to create a device for each market, entry level, mid range, and pro-sumers. This is a very large leap of a prediction!
Based on HD monkier rumor, and haptic feedback rumor.. To me, the haptic feedback is the missing "killer feature" an iPad needed to stay on top for a long time and for Tim Cook needed to come out with a bang.
iPad HD (no numbers, ever - just like iPod range) to be announced today:
Haptic feedback, pen based input for annotations and drawings, A6 quad core chip, retina, LTE, much better front facing camera for facetime and potential Siri (not sure on point other than annotation). 128gb option. 1gb of ram (maybe 1.5 at a big push). Same battery as current and slightly thicker.
Based on my own reasoning, no rumors involved. Would be sold as entry level until later this year.
iPad 2S (continuing the numbered range) for mid range market, to be announced today:
No haptic feedback (will come next update), tri core or upgraded duo core processor, better camera, 50:50 on retina as they would keep the current resolution in the mini, so multiple resolutions still exist regardless and this would keep cost low, LTE and better camera. Completely unsure on Siri. No 128gb option. Slightly better battery and same thickness.
EDIT: Actually, I'd be voting with 80% confidence, no retina on this model, but same mobile chip as the HD (ie, 3G vs 4G).
FURTHER EDIT: And this will be the "one more thing"
iPad mini to be announced later this year in time for Christmas:
Same as iPad 2S but with smaller screen. Litterally imagine the iPad 2S had a baby. Potential addition of haptic feedback to compete with note style phablets (or for them to compete with this!) and definite addition of Siri. No 64gb option.
EDIT FROM ABOVE: unless this is the "one more thing".. but I doubt it.
Based on supply rumors, apple store down for updating and previous rumors..
Apple TV 3 announced and available today:
addition of 1080p. Not much else to say.
iPad 2S available 9th, HD available 16th.