https://github.com/monero-project/bitmonero/releases/tag/v0.9.3
Information from Github:
This has urgent and important bug fixes to 0.9.2 Hydrogen Helix
- Urgent bug fix for database corruption issues in 0.9.2
- Official Windows 32-bit releases are back
- Updates to miniupnpc
- Sets v3 fork date for September, 2016
- Fixes core tests and re-enables them
- Fixes a problem with --password-file not working in RPC mode
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General hardfork information:
Background:
https://forum.getmonero.org/4/academic-and-technical/303/a-formal-approach-towards-better-hard-fork-management
- Blocktime is bumped from 1 to 2 minutes. See:
https://forum.getmonero.org/20/general-discussion/2401/increasing-the-block-time
- Minimum blocksize is bumped to 60 KB. See:
https://forum.getmonero.org/20/general-discussion/2409/increasing-the-minimum-block-size
A big advantage of this is that current individual transactions that sometimes won't go through (because they are a bit above the median due to many outputs (e.g. dust), or the daemon / MyMonero rejects them for some reason) can easily be included in the block without incurring a penalty. Above is a bit of a blunt explanation, I am sure one of the core-team members / developers could give you a more detailed explanation.
- Finally, the recommendations from the MRL team stated in MRL-0004, of which the minimum mixin >= 3 is probably the most salient. See:
https://lab.getmonero.org/pubs/MRL-0004.pdf
P.S. Due to variance the hard fork will likely be on the 21th or 22th of March. A specific block height was determined for the hardfork, not a specific date. The specific blockheight for the hardfork can be found here:
https://github.com/monero-project/bitmonero/blob/master/src/cryptonote_core/blockchain.cpp#L83
P.P.S. As long as you are on any 0.9.x version in advance of the hardfork you are fine.