The Isometric ILU (Intermediate Life Upgrade) programme, the longest and most expensive upgrade in DDS history, has finally been completed with the return to the fleet of F123 Devonian and F124 Ordovician. The whole fleet of (now) 18 frigates is to ILU standard though there have been some improvements to the ILU specification during the lifetime of the programme and these earlier upgrades are being bought up to the later standard during routine maintenance.
The next major upgrade is likely to be the Terran Sea ILU and unification though this will not begin until after the end of current hostilities (and is planned for after 2112 anyway). The Isometric jig is now to be given over to full Freedom 41B production. Four more of the latter have been ordered.
