Looks like Samsung Wave owners will soon be graced with an official firmware update to bada 1.2, supposed to make the mobile OS more responsive, and including Swype. The leaked software showed up on SamsungFirmwareWorld, but you have to register to retrieve it. It is clearly for GT-S8500, i.e. the original Samsung Wave.
The process requires an additional tool, thus don't rush to update your Samsung Wave yet. Moreover, it looks slated for the European market versions of the handset. It won't be long before it pops into your Samsung Kies software, so stay put for the official news.
Samsung Wave Specifications