We won't know until it happens, but my best guess is it's going to be about increasing training options for each position, or maybe just some positions, such as allowing training a skill like passing or handling for just the SG, SF, PF and/or C (currently only a PG can train as a single position for those skills). The affect of that sort of change would mean that you wouldn't have to train a player out of his natural position for the purpose of training those skills affected. It won't be about increasing training speeds. If anything, it might mean decreasing training speeds for when training a skill at a position where skill is less used, but we won't know until it's implemented.
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!