Presently under Central law, exporters are allowed to obtain duty paid inputs, avail ITC on it and export goods upon payment of duty (after utilizing the ITC) and thereafter claim refund of the duty paid on exports. Will this system continue in GST?

Yes. In terms of Section 16 of the IGST Act, a registered taxable person shall have the option either to export goods/services without payment of IGST under bond or letter of undertaking and claim refund of ITC or he can export goods/services on payment of IGST and claim refund of IGST paid.