Springers are on the way out as a commercial force with R&D involved, no two questions about it. Apart from the Omnia (a missed opportunity, I think) there hasn't been any really new springers in recent years. But lots of things have happened in the past 20.
The Walther LGV came out in 2012. While it didn't introduce any new concepts per se, it combined all the best tricks of the trade in a way that really did tame the spring gun.
My LGV shot like a well-tuned gun straight out of the box, with dazzling accuracy, zero twang or buzz, close to no recoil, very mild report etc. I wish I hadn't wasted my time and money on a HW95 and gotten the LGV straight off.
On the power side of things, Diana came out with the 350 Mag in 2000, the 460 Mag in 2007, and the 350 Mag Ntec in 2014 (not 100 % sure of the last date). These were progressively more and more powerful spring guns that were also high-accuracy & high-quality.
In the same time frame, Hatsan introduced affordable super magnums in the 125 and the 135, reaching never-before-seen power levels in mass-produced spring guns. In short, the 90's had the Patriot, the Theobens and the HW90. The 2000's saw plenty more options to choose from.
Diana also introduced scaled-down versions of their magnums in the 2000's, including the D46 and the D430. These have been discontinued, as has the SIG ASP, the latest comer (and goer), and the only new American spring gun in eons. I'm not sure when Weihrauch came up with the scaled-down HW77, the HW57.
Diana's latest springer entry, the 34 EMS (2021-), has been re-designed / re-defined from the ground up, and has features like adjustable barrel shims to suit the sight preferences of the owner. This is new, as far as factory-spec guns go.