Any predications for todays keynote?

Sustainability, price increases, roadmap, bellisimo. They are my guesses

Updates to the training, perhaps new training courses for commerce?

So they're getting rid of registered partners, how much does it cost to become a Silver Partner?

No idea: behind a form?! https://umbraco.com/partners/become-an-umbraco-solution-partner/

yeah I looked at this page

Not sure if these prices are accurate or up to date but the last time I saw a price for Silver was £5,306 per year. That was from a document dated 2023

The partnership band you're eligible for is the amount of money a company spends through Umbraco in a year (e.g. on cloud, training, I believe CG tickets count too). you aren't handing over £5K just to say you're a partner.