From Lance Pugmire on Twitter:

Just filed to Los Angeles Times - California, national and world news - Los Angeles Times updating @FloydMayweather @mannypacquiao talks. Not done, but they've agreed on @MGMGrand as venue
Mayweather and Pacquiao closing in on purse split, according to official involved in the talks. Drug-testing plan is done.
As they hammer out purse, next step is to get @SHOsports and @hboboxing to get the broadcasting plan sorted out.
Very important to note until it's done, it's not done, but Thursday was a good day for the long-awaited super-fight, I'm told