We're told that units will start to arrive at Palm HQ in June as production ramps up for launch later this year -- a timeline backed up by an internal marketing slide we received that lists WiFi-only, AT&T 3G, and Verizon LTE versions of the Opal arriving in September 2011, and on AT&T LTE in July 2012. The slide also indicates the Opal will have a particular e-reading focus, which makes sense for a 7-inch device, and there's a mention of "premium audio," which nicely reinforces our speaker hypothesis. Unfortunately, we don't have any word on specs or pricing yet, but these things had better be packing some serious heat for cheap if Palm is really planning to wait until September to launch them -- they'll be going head-to-head with the Xoom, the PlayBook, and presumably the iPad 2. We're still digging for more, so keep an eye out -- things are going to get crazy leading up to February 9th.
Update: We're told that they both have unspecified 1.2GHz processors, and that Topaz may arrive before Opal. We'll let you know if we learn anything else.