June could be a hot month for 10-inch tablets if a recently leaked document from "a major U.S. retailer" containing release dates and prices turns out to be true. The document, obtained by PreCentral, shows the HP TouchPad set for a launch three months from now – as recently confirmed by the company's CEO Leo Apotheker – with the 16GB Wi-Fi version priced at $499 and the 32GB unit going for $599, right in line with the equivalent Apple iPad 2 models.

Apparently there's also a 10-inch Honeycomb tablet from HTC slated for a June launch, even though its 7-inch Gingerbread-powered Flyer has yet to hit U.S. store shelves. Dell, Acer and Toshiba would also be releasing Honeycomb tablets around that same timeframe priced between $450 and $500, while the BlackBerry PlayBook is apparently coming near the end of March with $499, $599, and $699 price points (earlier rumors point to an April launch).

Additionally, HP has a 7-inch webOS tablet (codenamed Opal) in the works with a planned release in September. Needless to say, you should take all this with a grain of salt, as delays are all-too-common in the industry and some of these products haven't even been officially announced.