It's rumored that the a7000 is going to be announced at CP+ in February 2016.
There are a few differences with a DSLR over a mirrorless. A DSLR will be able to focus faster and be able to keep moving subjects in focus better than a mirrorless can. Therefore, if you plan on shooting anything moving from people walking down the isle or a football player, then go with a DSLR. The Pentax K3 II has a mode specifically designed for night/star shots. Mirrorless cameras all use electronic viewfinders (EVFs), which can be very beneficial depending upon which camera you're talking about. The newer cameras have much less lag time between the movement of the subject/camera and what you see in the EVF. The EVF offers features not found on a DSLR such as focus peeking and showing you the image as it will be exposed. If the EVF image is too bright or dark, then you're exposure is off.
Technically, the mirrorless cameras focus much more accurately on non-moving subjects than a DSLR can. They're also a lot lighter and smaller, which allows you to take it with you more often than a larger DSLR.
If track focusing is not an issue, then there's little reason to not go with a mirrorless like the A6000. As "old" as it is, it's still one of the better mirrorless cameras on the market. The down side to Sony's mirrorless is the quality and quantity of their native lenses. In terms of quantity, there are few and far apart which is why most users will get lens adapters for other brand of lenses such as Canon, Pentax, Nikon, etc... The native lenses are generally not as good as a comparable Nikon or Canon even though they cost about the same. Using non-native lenses will mean an additional $300-$400 cost in each lens mount, and a huge reduction in focusing speed.
Video wise, the Sony eats Nikon for lunch. Currently there's no Nikon that can match the video quality and features of Sony's mirrorless, especially in their a7 series of full-frame cameras. In fact, Nikon DSLRs are some of the worst cameras to use for video and Canon isn't too far behind. Currently Sony a7S, A7, and A7R along with the Panasonic GH4 are the best cameras for video/photo. Although it's best to get a camcorder for those shooting video on a regular basis.