I looks like Chase is sending out targeted mailer offers with increased welcome bonuses on both the Ink Plus and Ink Cash business credit cards.
You'll need to receive a targeted mailer offer to apply for either of these increased offers, but if you do you can potentially earn 100k points for opening a new Ink Plus and 50k points for opening a new Ink Cash business credit card.
The offer being sent out on the Chase Ink Plus business card is for 100,000 Ultimate Rewards points after spending $5,000 within the first 3 months.
Source: http://imgur.com/zIbjKzt
This is 30,000 points higher than the increased offer currently available in-branch and would be a great time to apply for the card if you are still until 5/24. It makes me think if there are any lucky individuals out there who are still under 5/24 and received this offer plus apply for the new Chase Sapphire Reserve card. That would be a quick 200,000 Ultimate Rewards points!
https://imgur.com/a/biQ5Q
On the Ink Cash the offer going around is for $500 cash back, which I would assume comes in the form of 50,000 Ultimate Rewards points. For some reason the Ink Cash offer is always marketed as cash back, even though the welcome bonus is awarded as Ultimate Rewards points.
Unfortunately these offers are only available through targeted mailers which have a unique offer code included in the marketing material. Chase will also not match these offers unless you can provide a unique offer code.
How to get a code?