It will be higher. The personal housing is meant to last a long time and will not be a low price. I wouldn't be surprised if the cost is closer to FC house or a little less. 1.5M for a small, 10 to 15M for a medium and 40M+ for a large. There are some players that have made a lot on crafting, selling primals, gardening, rare mats from retains, spirit binding. Given SE uses FC housing and private rooms to pull gil back out of the game to keep the market in check, you can expect high prices on personal housing. In other words, start saving your gil now if you want a personal house when they come out. I have been saving for months.