If you aren't interested in the iPad 2 features, and you can wait just a bit, you will probably se the current iPad discounted to make way for the new iPad.
No one really knows if the mock ups are real, and it would annoy me if I bought an iPad and a new version came out weeks later. If the mock ups are correct, you can buy a referb later at a reduced cost.
Why don't you just wait for the announcement, see how it looks like, then decide? It's not like the current models will be pulled from the shelves immediately after the announcement. You'll have at least a month or two to decide.