Well, first off...the 8520 is not a Storm, it's a Curve. The 9520 (which you put in your profile here) is a Storm.
So, if your question is about the 9520, then the answer is never. The Storm line is EOL, and as far as I understand, development stopped on the OS in the 5.0 range, and will never move beyond.
Occam's Razor nearly always applies when troubleshooting technology issues!
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