There's only one thing that can be done at the moment. Be patient. Be prepared to be offline a week or two or download the game again from scratch if things turns bad or be prepared to play on the Chinese client if you can't wait.
This patch will be a little special because big changes have been done on the warcraft client since cataclysm and the streaming downloader is probably one of our biggest enemy (you can thank the private servers for pushing blizzard to make it harder to play on old versions of the game).
We have a guide in the technical forum on how to patch to 4.1.a , BUT WE DON'T KNOW IF THIS WILL WORK YET!IT'S STRONGLY RECOMMENDED TO STAY ON HOLD
until someone who has been able to acutally play on the chinese servers with a foreign client come on the forum and explain how he made it work.
For those willing to download the patches in advance use this website http://www.wowwiki.com/Patch_mirrors
Start with :
3.3.x → 184.108.40.20611 Stage-1 (~1.74 GiB)
3.3.x → 220.127.116.1111 Stage-2 (~2.6 GiB)
3.3.x → 18.104.22.16811 Stage-3 (~760-790 MiB)
3.3.x → 22.214.171.12411 Final Stage-4 (~72 MiB) Do not use 3.3.x → 126.96.36.19911 Parts 1-4 — Full (~4.9-5.3 GiB) because if your download got corrupted (like it happened to me) you gotta redownload again 5gb of data.Then keep downloading the patches up to 4.1.a :Important notice:
depending on the website you download from, the patch may be non-streamed versions or full versions. What you want is the full versions since we have no guarantee streaming will work for us. So if you download 188.8.131.5205 → Patch 184.108.40.20687 220.127.116.1105 to version 18.104.22.16887 — ~470Mib and see the files you downloaded is only 4mib or so it means it's not the full version so try another link (atomicgamer seems to work fine).
22.214.171.12411 → Patch 126.96.36.19964 incremental patch (patches to build 13164) — ~560Mib
188.8.131.5264 → Patch 184.108.40.20605 incremental patch (patches to build 13205) — ~23Mib
220.127.116.1105 → Patch 18.104.22.16887 22.214.171.12405 to version 126.96.36.19987 — ~470Mib
188.8.131.5287 → Patch 184.108.40.20629 4.0.3 (version: 13287) to 4.0.3a (version: 13329) — ~144Mib
220.127.116.1129 → Patch 18.104.22.16896 4.0.3a (version: 13329) to 4.0.6 (version: 13596) — ~171Mib
22.214.171.12496 → Patch 126.96.36.19923 4.0.6 (version: 13596) to 4.0.6a (version: 13623) — ~4Mib
188.8.131.5223 → Patch 184.108.40.20614 4.0.6a (version: 13623) to 4.1.0 (version: 13914) — ~310Mib
220.127.116.1114 → Patch 18.104.22.16807 4.1.0 (version: 13914) to 4.1.0a (version: 14007) — ~11-14Mib
Some links might work better than others. If you have problems try them all before reporting the download doesn't work.
Not trying to install anything yet would be a wise decision. Have a pick at the real world until the tech guys prepare a few bullet proof guides and you will save yourself a headache.