This week, we will be releasing Snort 2.8.4.4. The only way to stay current with detection for anything DCERPC related will be to upgrade Snort. We will not be releasing detection that does not use the new dcerpc2 preprocessor. On the upside though, the number of rules that will be needed in the NetBIOS category will be reduced greatly. This will make rule management a lot easier. Keep an eye on the mailing lists, snort.org and this space.”]
Source: https://blog.talosintelligence.com/2009/04/snort-284-is-nigh.html