While it is similar to the BA land short with water frozen to slush in the fuel, that was after an extended winter flight with OAT of minus 70C extremely cold. Followed by a continuous descent approach with engine power only being brought up at 4 miles finals - and they didn't spool up.
The weather is not cold enough and I don't believe that Asiana are part of the Tailored Arrival trials into SFO so they would not have been a continuous descent and would have made more noises about engine problems earlier.
However, a bad bird strike at the wrong time could cause a similar problem. I am sure that we will know inside 12 hours.