Good quality premium leather is generally pretty supple and with brands like Alpinestars/Dainese/Spidi etc you generally won't have that issue. I've had several Dainese and Alpinestars leather jackets and have never had to 'run them in'.
Some of the cheaper brands ex-Pakistan use buffalo hide which is considerably stiffer, in some poor quality cases it's almost like cardboard!
Your jacket shouldn't need any attention until it's been used and cleaned a few times and/or rained on at which point the leather will need reproofing with a beeswax based product as previously listed or SnoSeal/Nixwax which are two of the better brands (still beeswax based).
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