User blog comment:Dragonknight86/Phineas and Ferb on Hiatus after Season 4 ends/@comment-188360-20140325213239/@comment-1279469-20140325235346

It also turns out that Disney is not doing an upfront this year. No we won't know about the future of the series.

The only way to know is if someone asked Dan and Swampy at Comic-Con this year. Ever since this news came out, people will want to ask Dan and Swampy about this just like how people asked Dan and Swampy about Stacy and Perry ever since Happy Birthday, Isabella aired last year.