If you really want to get to know about RTW units (including mods such as EBs), the most informative thing is to look directly at the relevant text file - it's called export_descr_unit.txt (EDU file) and will be in the data folder of your EB installation. You can download a nice utility called Caligula that will allow you to browse units in the file easily and see what the different stats are (we should have it on our downloads here at the Org).
Be aware that EB seems to chance some stats that other mods don't vary so much - including swing speed and lethality. So it's not just the attack and defence stats you have to look at.
EDIT: just realised you probably meant you wanted to know more about the reforms, not the units. The reforms are Polybian and Marius. They happen in 209 BC and 107 BC respectively. I think the Polybian reforms largely replace "early..." units with vanilla ones - e.g. early hastati are replaced with hastati. Marius brings alone the legions. But the best way to find out the detail of the different units is the EDU file.
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