You'll never see games using TrueHD or DTS-HD MA. There's no reason to conserve disc space athe cost of computational power.
Video games push the computational power of consoles, not just in pure processing speed requirement, but also in memory requirement. Decoding both TrueHD and DTS-MA requires a lot of extra power a typical next generation title can't afford to spare without sacrificing other elements.
Besides, it's not like there's any equipment out there that doesn't understand LPCM. Any HDMI transport that can bitstream TrueHD or DTS-MA (HDMI 1.3) can also transport PCM 7.1, so there's no advantage to be gained from the compression.
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