There's been no word on US availability, but the HTC Desire & HTC Legend have gotten priced and dated across the pond. eXpansys, a UK retailer, has posted a £399.99 price for the HTC Legend and a £449.99 price point for the HTC Desire. That roughly translates to $625 and $700 respectively. That ain't cheap. eXpansys also lists April 12th as the date it'll become available. The Desire should be available in the UK through T-Mobile, Orange, O2, and Vodafone. We haven't nailed down a carrier for the Legend.
Amazon Germany actually has the price of the Desire listed at €419 which would make it roughly $570, a much more reasonable starting price point. In the end though, these devices can certainly expected to sell for much less when (and if) they get on a US carrier. $199 is almost always the starting point for new devices, anything lower is a bonus. But if you can't wait to get your hands on the latest Android offerings, be prepared to spend a little paper.