For 2nd Generation of Surface, Tweaks From Microsoft - NYTimes.com

Meanwhile, the 5th-generation iPad is likely to be unveiled over the next month or so

"And it appears that Microsoft will be leaving many tablet sales to the competition with the new offerings, too. The latest Surface tablets will not be available in smaller 7- to 8-inch versions, the most popular size in the market. The iPad mini and other devices in that size have become clear favorites among tablet shoppers because their compactness makes them easier to hold with one hand.
The Surface tablets have 10.6-inch screens, behemoths by tablet standards. This year, 57 percent of worldwide tablet shipments are expected to be in the 7- to 8-inch category, while 17.8 percent will be in 9- to 10-inch category, estimates IDC, the research firm. Tablets with 10- to 11-inch screens, like the Surface, are forecast to account for about 17.4 percent of the market.
Mr. Panay suggested that Microsoft will eventually offer a mini version of the Surface, but not until it is confident that it has the right product."

For 2nd Generation of Surface, Tweaks From Microsoft - NYTimes.com