This is pure speculation, but I think the reason they might change the action, is to save money.

The G70's keybed is not used on any other instrument...at least I think that's what you said on another thread a while ago.

Why make an action solely for one instrument, and tie up a production line?

I wouldn't be surprised if a modified E-80 keybed was used instead, or one from a synthesizer (hopefully not from the Juno Stage, as it has no after-touch...maybe they will use the Fantom G7's keyboard?

Most companies are run by the bean counters, not musicians...it's unfortunate, but that's seems to be how it is, and things get changed in order to save a few dollars on every instrument, which of course adds up when a lot of them are sold.

I think Fantom only weighs 36 lbs, so that's at least a 10 lb reduction from the G70...I know the guys I knew (only three, mind you) that had G70's, sold them because they were a hassle to transport.

I do know, that since the OMB and home keyboard market is mostly older players (50 and up), the weight (or lack of) seems to be quite important.