Here's the news -
This will provide a huge benefit to United and other * fliers in the US, who travel to Asia and especially SE Asia. EVA's flights from the US depart late night/very early morning (the 2300-0200 range). This means that instead of having to wait until noon the next day to fly, I'll be able to finish work, and go straight to the airport to fly out, and I'll arrive in SE Asia at around midday rather than very late at night. Similarly, the return flights leave Asia in the late afternoon/early evening rather than stupid o'clock morning (5-6am) getting into the US the evening the same day. That will effectively give me an extra 24 hours; either an extra day in Asia, or the same time but with one less vacation day to take.
Now let's hope the frequent flyer mile (especially elite qualification) accrual rate is decent for Star partners. :-)