As for the legislation itself, it would require property managers to be licenced, with criminal penalties for doing business without a licence. There will be a complaints regime, allowing licences to be suspended or revoked, but weirdly failing to comply with the Residential tenancies Act won't be a grounds for complaint, and there'll be no automatic notification tot he disciplinary tribunal if a property manager is found to have done so by the Tenancy Tribunal (these seem like good things to push for at select committee). Delivering services "in a way that falls short of the standard that a reasonable member of the public is entitled to expect" is grounds for a complaint, and I suspect that clause is going to get a real workout.
The legislation might get a first reading before the election, but it won't be getting any further until afterwards. Which means that if you want it to pass, you need to vote for a party which will support it, rather than a landlord party which won't.