Someone sent me an email telling me about this thread so I thought I'd make a comment or two. First off, full disclosure, I work for Phonic. RoadRanger would remember me from the Harmony Central board (or maybe not, I don't know).
The Acapela is on it's way, but won't be in stores for at least a few months. We just released the ad early to give people a heads up, I believe. I'm not the one who placed the ad. The price is set for that particular model (as shown in the ad), we just don't have an exact release date set.
The IS16 remote iPad software is only a minor indication of what to expect from the Acapela software. It will have a similar overall design. The Acapela will, of course, feature a lot more controls through the iPad that aren't offered on the IS16 remote app. If you've used an IS16 or a Summit, the Acapela will offer all of the same signal processors (EQs, dynamics, delay, EFX) - these can all be controlled with the iPad or using a mouse and monitor. The IS16 remote, you'll notice, neglects a couple of these.
Also, with regards to the IS16's HTML5 control, this is actually gone after the latest firmware update. The update essentially swaps HTML5 for iPad compatibility. They're still working on expanding this to other tablets too.
I apologize if any of this sounds like marketing speak, I'm just trying to clear up what's going on with the product. But if you've got any questions, don't hesitate to send us an email through our help desk or post something on our facebook page. I'll also try and come back from time to time to answer anything else that pops up in here.