To 'lose' all electric sources you would have to 'lose' both engine generators (IDGs), not be able to use the APU, have the RAT fail AND 'loose' the battery also. Even then you have some pitch control through the trimmable horizontal stabilizer (THS), rudder via cables (WHAT?) and roll with differential thrust via FADEC engines.
As for the ACARs reports, we are getting very sketchy information. Self-monitoring, self-diagnostics and self-reporting systems are not going to send a message of "There is an electrical problem." More likely is "#1 IDG failure, over-voltage...on and on" so there is no trouble shooting on the ground and mechanics scrambling for the manual and parts.
Second, most pressurization systems go through a degradation of auto, stby, manual if not more with dual channels. And even then outflow valves will close when certain values are reached.
Also, some are noting that the AF plane was preceded and followed by other aircraft that reported no problems. Yes, weather is dynamic and so it is completely possible for one airplane to transit an area with no problem and the next one have a helluva ride. Remember airplanes landed in front and made approaches behind the Delta 1011 at DFW.
As joejinx has noted, it is unlikely that a lightning strike brought this machine down but the real problem, in these deep waters is going to be finding and retrieving the FDR and CVR. If any thing seems certain, it is that this one is going to be difficult to solve.
