Exactly. I can't imagine what is the reason for a three years delay to come out with a tune. Especially they already have the same engine tuned for other models(335 etc).
By the time the Dinan tune for our cars releases, the next generation of 5 series will probably be out already.
2011 535i Alpine White, Oyster on black interior, Premium 1 & 2 Package, Magnaflow Full Cat-back Exhaust, JB4 Stage 2