Unless they just do both parts. The fifth (and I guess final) volume of the currect manga is coming out at the end of March according to
moetron.
But this seems like something for the Carnival Phantasm group. Though there are serious parts to the first story. All the heroic spirit battles. By the second it seems more intense (in action and comedy) with additional cast added.
The short Nanoha crossovers would be interesting, though the story is likely interesting enough with the White Devil and Fate.
Irisviel as lulz MILF is something to behold...more so in the second story than the first.
Will this be the first time Luvia has been animated? I wonder which voice she'll have.