According to Blizzard, the next patch will be released on SEA on the 27th of Feb, however the NA patch will be live on the 21st.
This is important as if you log onto NA with your client after the 21st but before the 27th, you will update your game and be unable to play on SEA for those 6 days.
I mention this as I can just imagine players updating their clients, messing up our ability to play SEACL, SEACC as well as other SEA events over the next week, which is something perfectly avoidable.
If you use a separate client (such as a Taiwan or Korean client) you are fine to update that one when the patch is live on those servers. This only really matters for the SEA/NA client as both servers are accessed from the 1 client through the region button on the login page.
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