Hashrate is taking a HUGE jump today

Its reporting 2900 mh so a maybe a new farm went online or upgrades completed on a old one.
I have my hardware paid for now and ive been slowly ordering some parts to build a new budget rig, just mobo, cables and stuff I have extra cpu's and psu's. But im starting to reconsider if I should really jump in with some new gpus the way difficulty is going. In a month there might be very very little profit if this trend continues, say in a month we hit 4'000 gh then the profit will be slim and from there how much further will the hash get pushed.