Research In Motion might be gearing up to launch BlackBerry OS 10 but that isn't stopping the company introducing a budget BlackBerry smartphone - the BlackBerry Curve 9320 - on T-Mobile in the UK in the meantime.

The new QWERTY smartphone, promised by RIM's CEO in the latest earning report, has been inadvertently leaked by T-Mobile in the UK before an official unveiling by RIM.

On seeing the mistake, the UK operator has since yanked any reference, but sadly for it, not before Google cache grabbed the offending page and the BlackBerry fan blogs picked up on the news.

The new phone, due in May according to T-Mobile, will offer a standard BlackBerry keyboard, Touch-sensitive optical trackpad, a 3.2 megapixel camera and 4x optical zoom.

With BlackBerry World saying the beginning of May in Florida, we suspect that RIM will want to get the announcement of the new phone out officially in the next couple of weeks before all eyes turn on the conventions announcements about BlackBerry OS 10.

We will keep you posted.