Not trying to bust your chops here, but can you provide an example of what you might be looking for in terms of an improvement. For example if the new BR Codec's were supported on the digital inputs that the 990 can accept, I could see that as being a valid request. IIRC, however, they are only supported over HDMI. Personally, I can see that Deromax's issue about the muting on digital input as something for a revison (it seems like providing an option to turn off muting could be easy to implement).

However, I can also appreciate from a manufacturer's perspective that there should be a time limit on firmware revisions. Perhaps 3-5 years from the date of last sale or the date of a posting on the sales site that the product has been frozen and no future revisions for the product are likely to be made. Of course that presumes a publicly available firmware revision request and acceptance list.

FWIW, I seem to recall that Outlaw did announce at somepoint that the last 990 firmware revision was going to be the last.