I was hoping the MX304 would be the upgrade, but it seems like overkill - 2U, modular with dual processors, up to 96 x 10/25 GbE, 48 x 40/50/100, 12 x 400 GbE
Probably a bit more expensive than MX204 too.
There's also ACX7100-48L: 48x 10GE/25GE/50GE (SFP56), 6x 400GE (QSFP56-DD)