WeatherCat Version 4.0.0 early dev release #3 is now available for testing. See https://athena.trixology.com/index.php?topic=3677.0 for more details and download.
Sylvester was replaced with the Twitter client in WeatherCat 3. And yes, there are plans for an RCP based desktop client, but it isn't in the immediate future. A 64 bit client is available as of V3.0.1 - see http://athena.trixology.com/index.php?topic=2755.0 for details.Cheers,Stu.