There's a new deathadder 4g coming out soon.
http://itbbs.pconline.com.cn/diy/15799112.html
Not a Chinese rip-off. There are box shots from German forums.
No one know's how the new Avago S3988, will perform. It's again a Razer exclusive like the s3888. But there are reports it will ONLY support the Synapse 2.0 drivers, No memory on the mouse to save settings like the current DA's...Way to shoot yourself in the foot razer.
If not a deathadder, there's always the Avago A3090 based mouses. There are tons in market.