This may not be directly related to Hamilton's skin colour, but it's definately some sort of manipulation to make the race for the championship closer than it probably would have been.
I'm not convinced that the latter is related to Hamilton at all, Hamilton's presence on the scene may be entirely coincidental. I do sense however that the powers that be in F1 have decided that they need to be more pro-active in their meddling to make F1 more of a marketable soap-opera for the main-stream media.
So the new arrangement, with teams/drivers no longer winning points during a race, rather merely receiving some points on loan for a few weeks, is great for keeping the non-specialist media interested It also helps deliver on the obligations they have to the circuits to ensure that every race is in some way relevant to the championship.