That last page was awesome and shows one of the advantages indie comics have over superhero comics: the passage of time. Wouldn't be surprised at all if Vaughn shows the natural progression of Hazel aging rather than a time jump or having to leave her as a infant.
As soon as my 2 year old took his nap I jumped right into this issue. That last page came close to waking him up, there was a big "OH MY GOD! but thankfully it didn't.