Unlike Bleach, Gintama and Beelzebub which all had their Anime cancelled, Bakuman ending appears to be the choice of the two authors themselves. Even so, it’s always a shame when a series like this comes to an end, particularly one as enjoyable as Bakuman.
Here’s what was recently said to confirm the news:
“Tsugumi Ohba and Takeshi Obata are ending their Bakuman manga series in this year’s combined 21st/22nd issue of Shueisha‘s Weekly Shonen Jump magazine on Monday, April 23. The magazine asks their fans to look forward to their next work. The 18th compiled book volume will go on sale on May 2, and the 19th and 20th volumes will follow in June and July, respectively.
The manga has been running in Shonen Jump since 2008. Viz Media is publishing the 11th volume of the manga in North America in June. The manga inspired three television seasons, and the third one will premiere this fall.”
*Credit to Anime News Network for the info*