I completely agree on Ättestupa being totally great, but unfortunately I don't have any info on the re-releases you talk about.
However, My favourite of theirs must be Musik för tomma rum, which is still available (I think?) through Järtecknet. Love their dark melodic senses.
Have you listened the Viktor Ottosson black metal (kind of) project Niding, which has similar kind of melodics? Not as great as Ättestupa, but kind of great all the same.
R.i.p Release the Bats.