A reverse onus at bail presumes that the accused should be detained pending trial and requires them to demonstrate to the court why they should not be detained, having regard to the grounds for detention. It doesn't mean that the accused will obtain bail or that the accused has to disprove the commission of the offence, but it shifts the burden of proof from the prosecutor to the accused and ensures better screening of the bail application that's before the court. It also reflects Parliament's intent that it ought to be more difficult to obtain bail in certain circumstances.
As mentioned, there were concerns that reverse onuses are being added but the reverse onus regime doesn't actually have any teeth; that it doesn't clearly spell out what the burden is that the accused has to meet; and that it is unclear what the relationship is between the reverse onus regime and other provisions in the code, like the principle of restraint and the ladder principle, resulting in some inconsistent applications across the country.
The bill would make it clear that, for example, the ladder principle doesn't apply to a reverse onus and that the starting point is not release when you're in a reverse onus situation, and it would clarify that the burden on the accused is to ensure they have a strong bail plan before the court that addresses the risk they pose, before the court could release them, if they're on a reverse onus.