Not yet released, down the track
Includes DB changes, you need to log all terminals out during upgrade
This version includes some non functional changes to bank reconciliation. V5 c9's general ledger is alot more flexible allowing postings to be modified : changing amounts, GL codes etc whereas with V4 all you can do is toggle delete/restore a posting.
Being able to fiddle other things on a posting has obvious implications for bank rec. In order to make transition from v4 to v5 simpler it makes sense, from a technical perspective, to drop a few things into v4 now to lay groundwork to accommodate this instead of rolling in bigger set of changes into v5.