An HP tablet is coming at tonight's Microsoft keynote but may not be the rumored Courier tablet, multiple sources indicate today. A contact for Reuters says to expect a media-centric, multi-touch device from HP at Microsoft chief Steve Ballmer's keynote, but doesn't provide details. Journalist Kara Swisher adds, however, that her own contacts are adamant it won't be the dual-screen Courier and instead will be a slate that runs Microsoft software.