Enderle and other analysts believe Asus will join Acer, Lenovo, Dell, Sharp, Samsung, LG, Huawei and others in producing Windows RT tablets running on ARM processors from Nvidia, Texas Instruments and Qualcomm. Hewlett-Packard is less a certainty, following its reversal on the WebOS tablet, Enderle said.

Enderle predicted that a 10-in. Windows RT tablet might be on the smaller side, with a 12-in. version more suitable for running and manipulating Office apps with a touchscreen.

Regarding price, Enderle suggested that Windows RT tablets will cost about the same as the iPad, a 9.7-in. tablet that starts at $499. However, Jack Gold, an analyst at J. Gold Associates, said they could be priced lower, at "$300-ish" but still not as low as the $199 price for the Amazon Kindle Fire.

"I don't think Windows RT tablets can get down to Fire prices in the short term, since you need a lot more computing resources to run Windows than Fire's modified Android," Gold said. "And Windows RT tablets won't compete directly with iPads which will have more memory, better chips, better screen and more."

Jeff Orr, an analyst at ABIResearch, said that a Windows RT tablet will probably be $79 to $99 more expensive than an Android Ice Cream Sandwich tablet of the same size. For example, the Asus Transformer tablet at 7-in. priced at $249 will compare to a Windows RT device at $329 to $349.