So I looked at the mythic spell list and it's a little unclear to me why these spells were selected.
I guess I'd figure you'd choose the absolute most iconic spells to be able to "mythic bump." Which some of them are, Bless, Sleep, etc. But Spike Stones, Magic Vestment, Move Earth? I would err on the side of the absolute most fairy-tale, iconic, kinds of spells to bother with mythic enhancement. Stuff you'd look at the list and say, "Classic!" About 70% of the list is like that but then 30% are the "I've never seen anyone take that" spells.
I don't think that's anywhere near a complete spell list. After all, the playtest document is only 54 pages and the book will be roughly 5 times as big.
And then there's table stop errr ... time stop. :)