I'm going to Senior Secondary this September, and I'm one of the first students to experience the 3-3-4 system (3 years JS, 3 years SS, 4 years U, while the old system is 3-2-2-3 from UK).
Liberal Studies (Discuss news and stuff)
And I've chosen:
Phy Chem Bio as 2 subjects, as 2 of which will combine into "combined science" in SS2.
ICT (IT, CIT, or whatever you call it
There are extensions for Maths, and I've decided to have Extension 2 [Algebra and Calculus?]
Some may study 1 more subject by themselves, and that makes a maximum of 8 subjects in the new HKDSE (Diploma for Secondary Education?) Exam 3 years later.