The estimated dates are in 21 Oct 2014 for Standalone (Behind The Firewall) instances, and in 27 Oct 2014 for OnDemand instances.
These dates might be postponed, however. We can't tell you for sure.
There aren't any workaround to achieve that, unfortunately.
I created this improvement request yesterday:
As can be seen above, the intention is to add all currently available instance types in Bamboo 5.7.
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