Do you think Sony had no idea what MS did last year? Even if they didn't know through internal channels, the advertising gave them some advance notice. And they did barely anything to compete. Either SCEA are way too slow to react, or they simply didn't have the flexibility to do aggressive or lengthy price cuts to counter MS. Like I said before, SCEE seemed able to go toe to toe with MS in the UK.
So regardless of whether Sony are prepared this time, they still need permission to do more than they did before. Which presumably means clearance from SCE in Japan.
SCEA and SCEE are independent companies, they have goals to reach for the fiscal year in terms of profitability and sales which are set together with a global strategy and they choose what's best for them to reach those goals.
Japan only gives them the list of hardware SKUs available, they decide which to import with the price in yen and they set the price they want based on local currencies keeping in mind their goals, they make specific regional deals and bundles.
Last year SCEA simply didn't want to cut the price or respond aggressively, they didn't have to save their product like Microsoft had to do in the US. They lost a couple of months, they didn't care although they admitted that in November the gap was more than they expected it to be, in December they made more deals with retailers.
This year is different, it won't go like last year, a strategy is in place, price will go down for the first time, there will be very important and strategic bundles (COD, Star Wars). It will be a heated battle.