What makes an OLTP database an OLTP database?
I would say that most production databases are OLTP with a little OLAP flavor. In a lot of shops the OLAP side of the world is getting more specialized and they really are performing the analytical functions outside of the normal application database. Are there shops that still plunk everything into one database? Of course. But as the capabilities improve (and Denali is no exception), I think you'll start to see a much more obvious divide.