This evening, Nokia posted an image on its official Facebook page teasing what appears to be an announcement for Monday, June 18th. While there's little to be surmised from the image itself, other than that it features a satellite image of Hawaii with a Nokia maps control overlay, location bubbles, and the date in big bold letters, whatever Nokia is planning just so happens to fall on the same date as Microsoft's mystery event in Los Angeles. Could the announcement be related to Microsoft's rumored tablet? We'll just have to wait and see.

Update: Nokia has added another image, a close-up of what appears to be a Roland TR-808 drum machine (Nokia's 808 PureView phone is expected to make its way to US shores in coming months). We've included it in the gallery below, and will be adding any additional images should they appear.

Update 2: All Things D is reporting that sources have told them Nokia's announcement is indeed for US availability of the 808 PureView. We'll keep you posted with any additional details.