Well, I'm pretty much ready for the upgrade, but concerned my disk space is too low. Is there an expectation of initial extra data needed? (I only have 10gb hard drive now on VPS running linux.)
I plan on upgrading or getting a different VPS soon but wasn't sure if I need to do that today, or if I have a week+ to do some research on my options.
Anyone have an idea based on testnet?
https://dashpay.atlassian.net/wiki/display/DOC/Masternode+Update (Work in Progress)

For the people who are not willing to pay for the increasing costs of running a masternode, I suggest you to look into setting up a Pseudonode for DASH. I'm quite certain it'll be possible with minor tweaks based on this code:
https://github.com/basil00/PseudoNode