A fast replacing successor to Acer's first Liquid smartphone (the A1) is on the way which primarily differs at the software level with the use of Android 2.1 (as opposed to 1.6 on the A1).
Hardware wise, there don't appear to be any major modifications here. It uses a 3.5-inch touchscreen, has a 5MP camera, GPS, an accelerometer, microSD slot for storage expansion, WiFi and BlueTooth 2.1 support and a 3.5mm audio jack. The brain of the system is a 768MHz Snapdragon chipset setup with 256MB of RAM and 512MB ROM.
While there's no official word on a release date yet, the new model's development looks to be on the home straight and should start shipping very shortly.