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The 4th Edition rulebook is current, but too streamlined - no upkeep phase, incomplete prep phase. It mentions a 4th Edition Expanded Rulebook, which I don't think we have yet.There is an Upkeep Phase - it's under U in the REG Glossary. (Oddly enough, there's no entry for Preparation Phase.)This is probably the most up-to-date description of the phases.
There was a plan to release an updated rulebook alongside REG 5.0 and there was some preliminary work done on that. However, 5.0 took a bit more time than planned (shocking, right?) and we needed to start focusing our time and energy on the next expansion so the rulebook project is on the backburner for now.
There was a plan to release an updated rulebook alongside REG 5.0 [...] [but] we needed to start focusing our time and energy on the next expansion so the rulebook project is on the backburner for now.
Depending on what is needed for the rulebook, I'm sure you can find a volunteer to work on that. Of course I don't know anyone who would want to!