copyobj behavior change in HG2
the behavior of Matlab's copyobj function changed in R2014b (HG2), and callbacks are no longer copied.
General-use object copy
Matlab's dual internal serialization/deserialization functions can be used to create duplicates of any object.
Auto-completion widget
Matlab includes a variety of undocumented internal controls that can be used for an auto-completion component.
Undocumented view transformation matrix
Matlab's view function returns an undocumented output transformation matrix.
Handle object as default class property value
MCOS property initialization has a documented but unexpected behavior that could cause many bugs in user code.
Plot legend title
Titles to plot legends are easy to achieve in HG1 (R2014a or earlier), but much more difficult in HG2 (R2014b or newer).
Using Infiniband with Matlab Parallel Computing Toolbox
Infiniband networking can significantly improve PCT performance in Matlab parallelization and distributed computing.
Frameless (undecorated) figure windows
Matlab figure windows can be made undecorated (borderless, title-less).
Transparent legend
Matlab chart legends are opaque be default but can be made semi- or fully transparent.
Customizing Matlab uipanels
Matlab uipanel controls can be customized using Java in ways that are impossible with plain Matlab.