The next cuts should be late April, but the big cuts are coming May 28. After May 28, the 2.2A that nows runs nearly $500 should hit the the streets at about $220. The 2.0A should then sell for $180 or so, while the 1.8A should run $150-$160.
Basically, if you wait until May 28, you can get a 2.2A for a bit more than the 1.8A costs now, and a 1.8A for the current price of the 1.6A. The new 2.4A will cost a small fortune at $500, just as the 2.2A does now.