There are Haswell laptops out now, by the time 2015 rolls around there will be Broadwell chips and Skylake will be poised to release. At the very least there will be performance upgrades just from the new architecture's even in comparative SKU's (Haswell i3 vs Skylake i3).
It's better to stay with your old A4 Cpu or wait or should upgrade now with i5 haswell?
* Are you satisfied with the performance of your current system? Do you have the budget to get anything significantly better? Do you feel it is worth upgrading anyway?
As for whether an i5 is better than some other option.
What benefit do you think the i5 has in particular over other options? What are you looking for (because with gaming, the CPU in particular doesnt matter too much) and what do you want?