Ethiopian Airlines plane had "flight control problems
Standard practice. That statement is deliberately vague. It's in the airlines interest at this stage to use such wording that people assume a link between this and Lion Air, and thus forming the opinion that it's a design problem rather than an airline operating issue. Pretty standard practice.
Remember the Lion Air had a known and reported defect the flight before. It could of course be teh same issue, and this time the crew (like the Lion Air crew) didn't react (despite the new training)
UK bans Boeing 737 MAX planes from British airspace
This one w somewhat more surprising, but I'd be reticent to jump to any real conclusions. The Airline industry is very Machiavellian, the CAA could have bowed to some political pressure - they may be using it as a stick against the FAA or Boeing as a bargaining point on another matter - Airbus may have lobbied (Don't ever think the FAA or CAA are truly independent or impartial. Similarly the FAA may be under pressure to support Boeing and the American carriers.
I doubt there is much new information that isn't in the public eye at the moment - but there could be something more from the radio conversations between the Crew and ATC
Look at crash scene pictures - who even needs to examine the wreckage is in for a painful time given the seem to have collected it and piled it high. Good luck with that jigsaw.
It'll be the ADR and CVR that hopefully give some indication of where to start looking. The problem with tos aircraft that are grounded awaiting to be inspected, is that no-one knows what they're looking for. This could have been an APU failure in the (smoke from rear) causing flight control issues despite redundancy - which would be a completely different fault