Changes to API

Was going over my notes the other day and noticed (at least for me) a few changes to the CRM API interface

https://worldsecuresystems.com/catalystwebservice/catalystcrmwebservice.asmx    

mainly:

OrderList_RetrieveByContact

Case_AddThreadItem

Which are both listed as "beta", pretty straight foward in software terms what this means but in the word has morphed its use on the internet, so with that said does beta mean:

We are testing and 100% being implemented after a "testing phase"

or

beta in the sense "we are testing this and might take it away in the future if it doesn't work out or not popular"

?

Just want to be careful in adding new features that are just "testing"