HP promises to release several WebOS devices in 2011, likely including a brand new all-touch smartphone.

HP's Jon Rubenstein today promised that HP will release several WebOS devices next year. According to PreCentral, Jon Rubenstein told attendees at the Web 2.0 Summit that the pool of WebOS devices for developers to target would grow dramatically over the next 12 to 18 months.

Palm recently unveiled WebOS 2.0 (and the Palm Pre 2), a significant OS upgrade that provides a range of new opportunities for developers. This upgrade will be rolled out to existing Palm WebOS customers over the next few months.

Palm is known to be working on a WebOS tablet, currently known as the Palmpad, but Jon Rubenstein didn't want to elaborate on this project, beyond promising that it would be a great tablet for consumers.

Given HP now promises an increase in WebOS devices next year, we guess the rumored Palm Mansion all-touch smartphone should be expected to roll out in time for a mid-2011 release.