- Option `block` of `model` can now be used in conjunction with `use_dll`
- New heteroskedastic filter and smoother, where shocks standard error may *unexpectedly* change in every period. Triggered by `heteroskedastic_filter` option of the `estimation` command, and configured via the `heteroskedastic_shocks` block (!1844, !1851)
- New non-linear least squares optimizer based on `lsqnonlin` for computing the mode (available under `mode_compute=13`)
- Options `block` and `bytecode` of `model` can now be used in conjunction with model-local variables (variables declared with a pound-sign #) (#1243)