Zh1nt0 (BFBC2 Community Manager) has confirmed that Oasis and Harvest Day are coming to BC2! He says that the maps will be free with VIP and that new information will be released tomorrow. He said that completely reconstructing the maps took weeks. Now we know why there was the sudden release of VIP and then the sudden stoppage (Other than Vietnam)! Now were gonna have to edit the BC1 maps!
I get my sources from EA's BFBC2 UK forums