As DSLR's seem to be where the money is I am sure that Sony want to make a good impression and become a serious player. By serious I mean challenging Canon.. forget even Nikon! This will take time, but as an electronic goods company they are in great shape to compete with the rapid lifecycle of DSLR's these days, especially Canon. Add to that the fact that Sony also makes it's own chips and together with the KM platform they have a winning recipe. However to win they must really listen to consumers, and see what the others aren't offering. Canon for all it's might is still missing the damn MLU button, so I would suggest to Sony to offer it sooner rather than later. Nikon seems to be offering everything (including pro level consumer cameras such as D200) except a full frame sensor.. and seeing as Sony is committed to continuing some of KM's lenses, which are optimised for 36x24mm film.. I would venture that Sony will eventually bring out a full frame body...
In my mind Sony has been shopping for an SLR body for a while.. perhaps toying with Nikon (for example joint product development for the DSLR sensors) but finally opting for KM which by buying it outright now controls completely. Obviously as a company the size of Canon (a behomoth) it will want to seriously compete. Whether it will go all-out into the professional segment is the big question. I doubt it, at least in the short term, but this will not preclude the production of "professional level bodies".
What does this mean? Well, both Canon and Nikon assure their pros extra service, such as lens loans and urgent repair services. I doubt Sony will be interested in as much... BUT as serious amateurs probably account for more sales of "pro" gear, Sony may aim their products at them.. This will mean a cheaper product with as good quality.. or better.
As for assuring a product line Sony seems determined to appear serious. Their initial lens selection, a high quality DSLR "consumer" camera, and an integrated selection of accessories mean they are here to stay, whatever the big boys may wish to think. You have seen the tip of the iceberg.. a lot more has yet to come (no, I don't work for Sony.. my crystal ball just seems very clear at the moment).
HOWEVER the product roll-out of a new DSLR lineup will take time, at least a few years, as it gains market share and getS people onto the product upgrade cycle (like Canon). so be patient..
Overall.. a serious player with pretty serious products..
just don't hold your breath for a Full Frame quite yet..