From the article it looks like commonality with the fleet of logistics H2 8x8s already in Swedish service. I wouldn't doubt that there are also some stability and robustness improvements and longer range (800kms v 650). OTOH the 8 x 8 is a more complex chassis.
I'm still not an overwhelmed fan of either the Archer or the RCH 155 on Boxer principally because of the low on-board ammo count and the complexity of "bombing up" the turrets. I've recently watched an RCH 155 being resupplied with ammo and it looked worse than Archer. That's something that really needs working on.
I'm also not so fond of all the advertisements as to shoot and scoot. They make it sound like it provides some invulnerability that other systems do not have. IMHO the improvements in STA - including UAVs and OWUAVs - negates much of the shoot and scoot advantage with the old catchphrase of "you move; you die." These guns have very distinct physical signatures and will be high-priority sought after targets. I can't see these guns deploying without a robust dedicated anti-air capability/plan.
Don't get me wrong, they're still better than an M777, - especially the L52 barrel - but they aren't Superman.