BlackBerry fans, you may want to circle March 15th on your calendar. According to an image sent to our amigos at TmoNews, that's the date that T-Mobile and RIM will be showing us "What's Next." The invitation teases an event where "the latest and greatest T-Mobile BlackBerry technology" will be shown. Unfortunately for us, there's not really much more information to be had concerning what exactly be at the shindig, save for that complimentary breakfast that'll be served up (which sounds pretty good right about now).

So just what do the folks at T-Mobile and RIM have up their sleeves? That's still up in the air for now, but that big BlackBerry 7 logo on the invite suggests that something BB7-related could be in the pipeline. If you've got any guesses as to what might be planned, go right ahead and share them with us in the comments below. We'll keep our ears to the ground for more concrete details on what the focus of the event may be.

UPDATE: T-Mobile PR has gotten in contact with us to offer more insight into this event. This gathering will apparently be B2B customer/sales-focused, and T-Mobile has no plans to introduce any new devices at the event.

Via TmoNews