You'll notice that Epson tends to roll out new technology with a few printers rather than an entire line all at the same time. The 3800 introduced new screening tech, teflon-like coated heads and black switching, the x880 printers brought the K3+VM inkset and the 11880 brought the faster heads with dual black support.
The lack of dual black support on some models is Epson's Achilles heal that is paramount that they address next. Especially on the profitable and popular 44" category. I'd be surprised if the 11880 is refreshed to market by the end of the year. On a related note, the current price difference between the 11880 (with rebate $15K) and iPF 9100 ($9K) is notable.