It might be of some interest to notice that Super Typhoon Jelawat is the third earliest tropical cyclone to achieve status as a "Super Typhoon" behind Higos in 2015 and Mitag in 2002.
As some of you are aware of, an El Niño developed in both 2002 and 2015.
Other years that have seen Super Typhoons before the end of April is from what I can find:
2004, 2003, 1997 and 1989.
2004 and 1997 both saw an El Niño. 2003 started with a decaying El Niño but ended neutral. In 1989 a strong La Niña was in charge but ended up in cool neutral year.
All in all it seems that the odds for an El Niño just increased....
Happy Easter!