Squilliam has brought up a number of good points, I'm impressed. Unfortunately though, I fear the question of SCE's and Sony's profit outlook as a whole is going to rely heavily on quite a few unknowables.
1) At what point will the BOJ intervene in the currency markets vis-a-vis the euro and the dollar. It seems most of Sony's currency problems are coming from the (near term) weakness of the euro versus the dollar and the general strength of the yen. The fact that they haven't intervened yet seems to say either A) There was a new "plaza accord"-like agreement between the major economies or B) They are fearful that they already hold to much foreign debt denominated in currencies they have no control over and that they will be the last one's holding it.
Either way they have a history of surprise dramatic large scale interventions in the currency market and there is going to be increased pressure for them to do something as the Japanese economy has tipped back into recession and the government will have little options in terms of fiscal stimulus given the proportion of debt to GDP is already in excess of 100%.
2) Where and in what currency is most of Sony's manufacturing costs. Matsushita (Panasonic) is a terrible company to compare Sony against as they along with Cannon are notoriously Japanese (ie. significant proportion of production occurs in Japan, they still adhere to lifetime employment, and growth is mostly organic). Sony on the other hand is notoriously "American" in that they outsource heavily, employment policies are more in line with international norms, and they have never eschewed mergers and aquisitions as a means of company growth.
For both SCE and Microsoft I would expect most of the components to be manufactured in taiwan or mainland china (by a taiwanese companies operating in china). Now, whereas I know the PRC has allowed the RMB to appreciate significantly (as measured by percentage increase on an annual basis) since the begging of the year, I haven't seen or done any such analysis on the NTD recently. Usually, the taiwanese follow the lead of Japan currency-wise (in many subtle ways Japan still has suzerainty over the place), however these aren't normal economic times.
3) For the PS3 in particular it would be nice to know some staticstics on what Sony thinks it's marginal cost for each unit is. Until you know this and have some idea of what marginal demand is you cannot determine even in an extremely oversimplified, orthodox market model if they would stand to make or lose money and how much. This is complicated by the above average stickiness of prices in this market and the highly path-dependent nature of aggregate demant. The conole market is seems to be one of these markets in which multiple equilibra exist even before you add in the destablizing effects of it's deep supply-chains thanks to above-average irrationaliy.
Anyhow I suspect that SCE decided quite awhile ago that there would be a price-cut coinciding with the large scale production of the 45nm cell and the possibility of a smaller version of the PS3. Since the switchover to 45nm has been delayed until Q1 2009 by IBM the pricecuts are also delayed. Since the rumors are KZ2 is pretty much done, the tea leaves point heavily to Sony saving it to be bundled with the revised console at release. If this is true then KZ2's official release may date serve as a useful indicator for when Sony thinks it's going to have this new revision ready for mass market.