Since we're basically getting nowhere with an official bootloader unlock from Huawei, I've spent most of today reintroducing support for the 109808 baseband for CM. We obviously had this before, but the difference this time is the 3.0.8 kernel is running on that baseband, meaning we don't have a dodgy 2.6 kernel powering it, and everything is working as you would expect in CM9 R9.
The only differences behind the scenes are a minor kernel hack to provide us with enough framebuffer memory - the bootloader passes the start point and the size of the memory region to be used as framebuffer space, and as Gingerbread required less, the Gingerbread bootloader also provides less to the kernel, too little in fact. Additional changes are more obvious - bypassing a line in the RIL Java class, and replacing all the blobs related to the RIL with their equivalents from 109808.
Right now, this stuff is set up so it can be toggled when building CM9. I've got a test build available here: http://g300.thebrona...5-109808-A1.zip
Now, why would you use this? Well, it bypasses the problem plaguing custom ICS ROMs, the random 3G reboots, since a bootloader "unlock" is necessary to install them. Of course, if you don't have the reboots, then you have no reason to use it at all.
Maybe it's obvious but just in case: you need to be on the 109808 baseband to use the mobile network on it. For the vast majority of people, this probably means you need to downgrade to Gingerbread in order to use it.
...and one final point - don't install any recovery that uses a 3.0.8 kernel (yet) if you are downgrading, as it won't have the framebuffer hack in place that is necessary to bring the display up, so you'll be staring at the Huawei splash screen for quite some time.
Would I do this?
Then install this.