Do you want a DSLR because you also want to take pictures, or because you're going for affordability?
And what do you want to shoot?
As far as bang for buck goes, the BMPCC4K is certainly "exciting" when you consider pricepoint and features ($1300 and includes Resolve Studio). It's scheduled for release in September. Unfortunately Blackmagic has some history of missing launch dates and delivering buggy first-gen devices, so I wouldn't be at all surprised if it took until January or February 2019 before it was worth buying. Or they could release it early and it could be flawless/amazing. Hard to say.
Also on the vaporware front is the Sony A7SIII. Unclear whether Sony will push 4k/10bit/60p into the cam as that would require a processor update and potentially threaten the 4k60p-less FS5 MKII, which they've been loathe to do. But the company recently did an about face on color science and have been pushing their revised look into new cams, so maybe times are a changing and they're going to try to compete on specs. No speculated release date. The rumor mill says an announcement was supposed to take place this week but the recent success of the A7III (sold out everywhere) caused a delay. Worst case scenario probably announced at Photokina in September and available shortly after.
Finally, Canon is rumored to have a mirrorless video something or other that's actually out in the field and being tested, but no indication as to whether that will even be released this year.
But if things like 4k / 10 bit / 60p / RAW / AF don't matter that much to you or you really want to buy something today, there may be better options than waiting, just depends on your needs and priorities.