GA in about:pages was to my knowledge not intentional and covered under a special contract with google as they used that for their normal mozilla pages.

WebRTC is a standard and you can easily disable it. Pocket belongs to Mozilla and they opensourced large parts of it and will open source further parts.

Experimenting in this case signals the intent that they may want to explore the direction of "recommend websites to user" and they have, in the mailing lists, stated that if this will continue, they will develop the most privacy preserving option they can.

If you look at the stats their marketshare is increasing over the last few months (25->27% under non-chrome browsers)

IMO.