Others will be considerably larger, with the top of the scale 84% heavier than the iPad -- 2.64 lbs. was the mass leader -- and at sixth-tenths of an inch, 66% thicker.

Screens sizes will range from 10.1- to 11.6-in., said Angiulo, which would give them all more real estate -- but not necessarily pixels, since he did not offer information on the resolution of those displays -- than the iPad's 9.7-in. screen.

will boast a 10.6-in. display.

Angiulo, keeping to Microsoft's secrecy line, said nothing about a price range for the Windows RT devices from the four OEMs. The company has declined to discuss prices of its Surface RT, as well as the slightly-larger tablet based on Windows 8 Pro.

Patrick Moorhead, principal analyst with Moor Insights & Strategy, didn't think it was a coincidence that Angiulo blogged today about upcoming Windows RT tablets and PCs.