According to James Allen , the FIA is considering giving out the weights for all the cars after Q3 .

When we had low fuel quals , back in the good ol' days , we never knew how much was on board for the race , so we knew who was fastest , but not how far into the race they would be able to go .
Then , we got fixed fuel qualifying , and though we knew how fast they were , but not knowing how far they were going , kept the mystery until the first stops , as it had before .

But , now , they are talking about Q3 lock-up , and at the same time , letting us know the fuel levels ?

It makes me wonder at why they think we would watch a race when we know the results before it starts .