Since you already have CS2 + CSS, Arks + BWW, and Cinebrass you already know what to expect from Alex, OT, and Cinesamples. I guess you don’t want to complete any of those series if you think they’re too old, and neither of them offer any complete orchestral series that are newer than those either.
Of the bigger developers, that pretty much leaves Spitfire the only option. Their symphonic series is just as old, Abbey Road is just barely getting started, and in-between that we have BBC which is newer and finished. If you are interested in a classical orchestra rather than cinematic that could be a god choice.
Then we have Audio Imperia with Jaeger, Nucleus, Areia, Solo, etc. They are certainly newer, but much more modern/cinematic than classical in their overall sound. And of course Hollywood Orchestra, though that’s even older than what you have. Thinking about it, I can’t really come up with any complete orchestral series apart from BBC that are newer and actually finished.
In the end I don’t really think what you have is that old (Cinematic Studio Series isn’t even finished yet), or that anything newer is necessarily better. Orchestral samples haven’t really innovated as of lately, at least not in how you work with them, and even with the most current ones you’ll still have to spend a lot of time massaging the samples if you’re aiming for realism.