SQL Server 2008 R2 SP2 and SQL Server 2012 SP1 introduced sys.dm_db_stats_properties. This DMV is a new way to check the number of rows that have been modified since the last time a set of statistics was updated. It is described here: (http://msdn.microsoft.com/en-us/library/jj553546.aspx)
In the latest version of Ola's tools, he's made use of this new DMV for customers that are on one of these SQL Server versions. For customers on earlier versions, he continues to use sys.sysindexes in the same way he did previously.
Another notable change is that the new version works better when combined with log shipping on the same databases (avoids options that would break log shipping chains).
Ola's tools have been gaining a well-deserved reputation, particularly given the price (ie free).
You can read more about the most recent version of the solution at http://ola.hallengren.com/versions.html or download it at http://ola.hallengren.com/scripts/MaintenanceSolution.sql