Let's see. CGL split ilClan like George RR Martin split "A feast for crows" so, a Feast For Crows came out in 2006. Dance With Dragons, the split off part came out 5 years later in 2011. As such, with Shattered Fortress coming out in 2018, I suspect we'll be waiting until at least 2023 for ilClan.
That IS what people mean when they say "BattleTech is game of thrones in space" right? ;P
Also TRO 3145 & FM3145 installments came out in 2013, and thats 5 years before Fortress. So, what's another 5?